Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae09718e543a37c4…

MALICIOUS

PDF

104.8 KB Created: 2021-09-04 04:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 71055b63c6a5699340ffd03cf83e0d38 SHA-1: 2de3c5912893b175f62c2f084dd5dd3848745911 SHA-256: ae09718e543a37c4d93a6e464e3b79b9fa345a35109be98770613e88754d523a
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=importance+of+microorganisms+in+food+industry+pdf PDF link annotation
    • http://rubivina.com/Images_upload/files/pobir.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ed88c342eb6---jajotabo.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/c6jn4jan2grf69nhck0jnvres9/guraxobitipemegide.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/volifoxobovore.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/20424235731.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b26a341746b---33183015766.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/vedevogedefesozerok.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/danewidavodomufisiwodut.pdfIn PDF document text
    • https://buyafranchise.org/files/files/32982113808.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab28b47714a---57942690940.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/4130672060.pdfIn PDF document text
    • http://huntland.hu/upload/file/53299890060.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/05250596e5cfa1934f9506335cf443d4/letogobanugenodotoduk.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/14140829733.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acb873d6431---27211813338.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/3997274299.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/fefigogegojularogexujel.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160dac477116c2---65779751518.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/13vdinmfnmv0in2nu7q5or1ic3/15256670628.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xagesobukuxob.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13243 18792 bytes
SHA-256: b7b39d9f88c38ff50c66c470dbb0494b1ec2641c6de22ce9696b30f7dcc4ce8b
font_01_sfnt_off0001638a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638A 11080 bytes
SHA-256: 3fcca3456b0c48d40c0965041f508e643cfea30c38cabdb08fb73cebb898f0b0
font_02_sfnt_off00017d31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1